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Effects of Hygrothermal Cycling on the Chemical, Thermal, and Mechanical Properties of 862/W Epoxy ResinThe hygrothermal aging characteristics of an epoxy resin were characterized over 1 year, which included 908 temperature and humidity cycles. The epoxy resin quickly showed evidence of aging through color change and increased brittleness. The influence of aging on the material s glass transition temperature (Tg) was evaluated by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). The Tg remained relatively constant throughout the year long cyclic aging profile. The chemical composition was monitored by Fourier Transform Infrared Spectroscopy (FTIR) where evidence of chemical aging and advancement of cure was noted. The tensile strength of the resin was tested as it aged. This property was severely affected by the aging process in the form of reduced ductility and embrittlement. Detailed chemical evaluation suggests many aging mechanisms are taking place during exposure to hygrothermal conditions. This paper details the influence of processes such as: advancement of cure, chemical degradation, and physical aging on the chemical and physical properties of the epoxy resin.
Document ID
20110011518
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Miller, Sandi G.
(NASA Glenn Research Center Cleveland, OH, United States)
Roberts, Gary D.
(NASA Glenn Research Center Cleveland, OH, United States)
Copa, Christine C.
(Ohio State Univ. Columbus, OH, United States)
Bail, Justin L.
(Ohio Aerospace Inst. Brook Park, OH, United States)
Kohlman, Lee W.
(Akron Univ. Akron, OH, United States)
Binienda, Wieslaw K.
(Akron Univ. Akron, OH, United States)
Date Acquired
August 25, 2013
Publication Date
April 1, 2011
Subject Category
Composite Materials
Report/Patent Number
E-17505-1
NASA/TM-2011-216999
Funding Number(s)
WBS: WBS 698259.02.07.03.04.01
Distribution Limits
Public
Copyright
Public Use Permitted.
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